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<h2><span class="refentrytitle">Struct template constructible_with_allocator_suffix</span></h2>
<p>boost::container::constructible_with_allocator_suffix</p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../boost_container_header_reference.html#header.boost.container.uses_allocator_hpp" title="Header &lt;boost/container/uses_allocator.hpp&gt;">boost/container/uses_allocator.hpp</a>&gt;

</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="constructible_wit_idm29963.html" title="Struct template constructible_with_allocator_suffix">constructible_with_allocator_suffix</a> <span class="special">{</span>

  <span class="comment">// public data members</span>
  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">bool</span> <span class="identifier">value</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
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<a name="id-1.3.10.14.44.4.4"></a><h2>Description</h2>
<p><span class="bold"><strong>Remark</strong></span>: if a specialization constructible_with_allocator_suffix&lt;X&gt;::value is true, indicates that T may be constructed with an allocator as its last constructor argument. Ideally, all constructors of T (including the copy and move constructors) should have a variant that accepts a final argument of allocator_type.</p>
<p><span class="bold"><strong>Requires</strong></span>: if a specialization constructible_with_allocator_suffix&lt;X&gt;::value is true, T must have a nested type, allocator_type and at least one constructor for which allocator_type is the last parameter. If not all constructors of T can be called with a final allocator_type argument, and if T is used in a context where a container must call such a constructor, then the program is ill-formed.</p>
<p><code class="computeroutput"> template &lt;class T, class Allocator = allocator&lt;T&gt; &gt; class Z { public: typedef Allocator allocator_type;</code></p>
<p><code class="computeroutput"> // Default constructor with optional allocator suffix Z(const allocator_type&amp; a = allocator_type());</code></p>
<p><code class="computeroutput"> // Copy constructor and allocator-extended copy constructor Z(const Z&amp; zz); Z(const Z&amp; zz, const allocator_type&amp; a); };</code></p>
<p><code class="computeroutput">// Specialize trait for class template Z template &lt;class T, class Allocator = allocator&lt;T&gt; &gt; struct <a class="link" href="constructible_wit_idm29963.html" title="Struct template constructible_with_allocator_suffix">constructible_with_allocator_suffix</a>&lt;Z&lt;T,Allocator&gt; &gt; { static const bool value = true; }; </code></p>
<p><span class="bold"><strong>Note</strong></span>: This trait is a workaround inspired by "N2554: The Scoped A Model (Rev 2)" (Pablo Halpern, 2008-02-29) to backport the scoped allocator model to C++03, as in C++03 there is no mechanism to detect if a type can be constructed from arbitrary arguments. Applications aiming portability with several compilers should always define this trait.</p>
<p>In conforming C++11 compilers or compilers supporting SFINAE expressions (when BOOST_NO_SFINAE_EXPR is NOT defined), this trait is ignored and C++11 rules will be used to detect if a type should be constructed with suffix or prefix allocator arguments. </p>
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